2817twf.doc/p 200847088 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種燈源(iamP)的驅動方法’且特別 是有關於一種應用於投影裝置(P_ection叩脾加㈣)之燈源 的驅動方法。 【先前技術】 請參閱圖1A，習知一種投影裝置100包括一燈源 110、一單晶矽液晶面板(liquid crystal on silicon panel， LCOS panel) 120、一投影鏡頭(projection lens) 130、一色 輪(color wheel) 140 以及一偏振分光棱鏡(polarization beam splitting prism)l50。燈源 110 發出一照明光束(illumination beam) 112。色輪140配置於照明光束112的傳遞路徑上， 並具有紅色濾光片（filter) 142r、綠色濾光片142g及藍色濾 光片142b，以使照明光束112依時序轉變為紅光112r、綠 光112g及藍光112b。偏振分光稜鏡150配置於照明光束 112的傳遞路徑上，以將照明光束112之具有s偏振方向 的部分光束反射至單晶石夕液晶面板120。單晶石夕液晶面板 120將如、明光束112轉換為具有p偏振方向的一影像光束 (image beam) 122,並將影像光束122反射至投影鏡頭13〇。 請參照圖1A與圖1B，其中圖1B之標號50為照明光 束112投射至色輪140上的光斑。由於色輪14〇是由多種 不同顏色的濾光片142所組成，而在相鄰兩濾光片142之 交界處144通過光斑50之水平線52a左端的時間T1至交 界處144通過水平線52a右端的時間12的期間内，水平 5 200847088 χ χ / / ^ ^.2817twf.doc/p 線52a會同時落在兩種不同顏色的濾光片i42上，因而產 生兩種不同顏色的光。因此，在時間T1至時間T2的期間 内’單晶石夕液晶面板120會處於關閉狀態，因而導致影像 冗度降低’並使投影裝置100的能源效率較低。請參照圖 1C，同理，在父界處144通過光斑50之水平線52b右端 的時間T3至交界處144通過水平線52b左端的時間T4的 期間内也會產生相同的問題。 ⑩ 请參閱圖1Α與圖2，習知一種燈源的驅動方法無論 單晶矽液晶面板120是處於開啟狀態或關閉狀態，皆以絕 對值相同的電流(電流值等於^或士)施加至燈源u〇，來 使燈源110發光，具體而言，燈源11〇在單晶石夕液晶面板 120是處於開啟狀態或關閉狀態時，皆發同一亮度之照明 光束112。然而，在單晶砍液晶面板120關閉時(例如時間 山至時間的期間），燈源11〇所發出的光無法被投影裝 置100所利用。因此，在导晶石夕液晶面板12〇關閉的期間 内施加電流至燈源110會造成電源無謂地浪費，使得投影 _ 裝置100的能源效率較低。 此外，在採用鐵電液晶（ferroelectric liquid crystal)面板 的投影裝置中，由於鐵電液晶面板在每個週期時間（例如 100耄秒至1秒)内的驅動電壓總和需為零，以維持直流平 衡(DC balance) ’所以鐵電液晶面板需交替地開啟與關閉。 換言之，在每個週期時間内，鐵電液晶面板有一半的時間 是處於開啟狀態，另一半的時間則是處於關閉狀態。同樣 地’在鐵電液晶面板關閉的期間内施加電流至燈源會造成 6 -2817tw£doc/p 200847088 ，源無謂地浪費’使得投影裝㈣能源 【發明内容】 本發明提供一種燈源的雕叙古土 _ 之驅動方法的投影裝置方法，以提〶使用此燈源 徵中本㈣所揭織術特 明或部份或全部目的或是其他目的，本發 提出-種燈源的驅動方法，用於—投影裝置 。投影裝置具有—光閥(峨valve)與—燈源。燈源的驅 度方法是根據光閥的多種狀態來使燈源呈現多種不同的亮 在本發明之實_巾，細具有—開 t而的騎;Γ—綠可包括下列步驟。當糊開啟= 薄的亮度為-第二亮度，其中第二亮;=閉使燈 在本發明之實施例中，燈源⑽動方法可包ςς 在光閥每次開啟時的亮度皆相同 ：源 閉時的亮度皆相同。 -源在先閥母次關 在本發明之實施例中，燈源的驅動 的第一亮度隨著光閥每次·而有所改變===燈源 二亮度隨著光閥每次關_有所改變。、'使燈源的第 在本發明之實施例中，燈源的驅動方法 直流訊號”施加—第-電流以及小於第由— 電流至燈源，以改變燈源的亮度。其中，當； 7 2817twf.doc/p 200847088 可施加第一電流至燈源；而當光閥關閉時，可施加第二電 流至燈源。 在本發明之實施例中，燈源的驅動方法可包括藉由一 交流訊號輪流施加一第一正電流、一第二正電流、二第一 負電流以及-第二負電流至燈源，以改變燈源的亮度。 在本發明之實施例中，當光閥開啟時，施加至燈源的 包流可為第一正電流或第一負電流；而當光閥關閉時，施 如至燈源的電流可為第二正電流或第二負電流。此外，第 正電流大於第—正電流，且第一負電流的絕對值大於第 二負電流的絕對值。再者，在施加至燈源的電流自第二正 電流變為第一負電流之前，可先使施加至燈源的電流增 加；且在施加至燈源的電流自第二負電流變為第一正電流 之前，可先使施加至燈源的電流之絕對值增加。 在本發明之實施例中’當光閥關閉時，施加至燈源的 電流可為第一正電流或第一負電流；而當光閥開啟時，施 力U至燈源的電流可為第二正電流或第二負電流。其中，第 〜正電流小於弟二正電流’而弟一負電流的絕對值小於第 二負電流的絕對值。此外，燈源的驅動方法在施加至燈源 的電流自第二正電流變為第一負電流之前，可更包括先使 施加至燈源的電流增加；且在施加至燈源的電流自第二負 電流變為第一正電流之前，可更包括先使施加至燈源的電 流之絕對值增加。 在本發明之實施例中，可以光閥開啟2N次及關閉2N 二欠所經過的時間為一個週期，且在每個週期内施加至燈源 8 200847088一。c/p 的電流和實質上為零，而N例如為3或其他正整數。 該燈源的驅動方法是根據光闊的多種狀態來使燈源 呈現多種不同的亮度。舉例來說，此方法可以在光閥關閉 時調低燈源的亮度，並在光閥開啟時調高燈源的亮度。如 此一來，本發明之燈源的驅動方法便可以有效提高採用其 之投影裝置的能源效率。 【實施方式】 籲 下列各實施例的說明是參考附加的圖式，用以例示本 發明可用以貝知之4寸疋實施例。本發明所提到的方向用 語，例如「上」、「下」、「前」、「後」、「左」、「右」 等’僅是參考附加圖式的方向。因此，使用的方向用語是 用來說明，而非用來限制本發明。 第一實施例 本實施例之燈源的驅動方法用於一投影裝置中。投影 裝置具有一光閥與一燈源，而燈源的驅動方法是根據光閥 的多種狀態來使燈源呈現多種不同的亮度。此外，投影裝 參 置可更具有一色輪，而光閥例如為單晶矽液晶面板、穿透 式液晶面板(transmissible liquid crystal panel)或數位微鏡 元件(digital micro-mirror device，DMD)。 圖3繪示本發明第一實施例之燈源的驅動方法之驅動 波形。圖3中的橫轴表示時間，而縱軸包含燈源所發出的 光通過色輪後的顏色、光閥的狀態、燈源的亮度以及施加 在燈源的電流值。請參閱圖3，在本實施例中，光闊可直 有一開啟狀悲與一關閉狀恶’且光閥會交替地開啟鱼關 9 !2817twf.doc/p 200847088 閉 動!法可包括下列步驟。當光閥開啟時，使 _真；M Ll。此外，#細_時，使燈 原的jL ’且第二亮度l2小於第—齐产 1 ° ，燈源之平均輸出功率所對應的亮度為平均亮^ §± > 2乙％〈 Ll。在本實施例中，燈源在光閥每次開 啟日守的党度皆相同，且P、、原y»忠 — 同。 且燈源在先閥母次關閉時的亮度皆相 ^實施例可藉由—交流赠m加—第—正電流 、一第一正電流h、一第一負電流L以及一第二、、点 =!、，以改變燈源的亮度。當光閥開啟時，施加】： 正電流11或第一負電流l3,而當光闕關 '，施加至燈源的電流可為第二正電流12或第二負電流 二此外第正電流I〗大於第二正電流I2，且第一負電 =13的絕對值大於第二負電流U的絕對值。舉例來說，在 糸」山至日守間4之間，光閥開啟，而施加至燈源的電流 二第正黾/;,L ，以使燈源的亮度為第一亮度L·〗。在時間 至日守間屯之間，光閥關閉，而施加至燈源的電流為第二 正電流12，以使燈源的亮度為第二亮度L·2。在時間屯至時 間A之間，光閥開啟，而施加至燈源的電流為第一負電流 l3’以使燈源的亮度為第一亮度Ll。在時間&至時間屯 之間，光閥關閉，而施加至燈源的電流為第二負電流U， 以使燈源的壳度為第二亮度^2。此外，第一正電流I〗與第 =負電流I3的絕對值可以相同，而第二正電流。與第二負 笔流14的絕對值亦可以相同。 ~i2817twf.doc/p 200847088 承接上述，由於在光閥關閉的期間，燈源所提供的光 束不會被_，㈣在糾__低燈_亮度，能有 J節f能源。此外’在光閥開啟時調高燈源的亮度，以使 第一壳度1^大於平均亮度Lavg’如此可有效提升投影裝置 的亮度。另外’相較於習知技術，在損耗相同能源的情況 下，由於本實施例之燈源的驅動方法將較多的能源運用於 光閥開啟時’歧㈣產生較高的亮度，所⑽有效提高 投影裝置的能源效率。 需注意的是，當施加至燈源的電流由正變負或由負變 正的過程中，會有某一瞬間的電流值為零，此時容易令人 眼感到燈源在閃爍。為了改善此問題，當施加至燈源的電 流在由正變負或由負變正之前的瞬間，可稍微增加電流的 絕對值，以使燈源的亮度稍微變大。如此，經由人眼視覺 暫留的作用，使用者便不易感到燈源在閃爍。因此，在本 實施例中，在施加至燈源的電流自第二正電流。變為第一 負電流I3之前，可先使施加至燈源的電流增加。同樣地， 在施加至燈源的電流自第二負電流L變為第一正電流〗1之 前，可先使施加至燈源的電流之絕對值增加。舉例來說， 在時間d3之前的瞬間，以電流1$施加給燈源，而讓燈源的 焭度為壳度L3。同樣地，在4之前的瞬間，以電流l6施 加給燈源，而讓燈源呈現亮度L3。電流I5略大於第電 流I2，而電流16略小於第二負電流14。 在本實施例中，可視光閥開啟2N次及關閉2N次所 經過的時間為一個週期P，且在每個週期p内施加至燈源 11 200847088」一 c/p 的電流和實質上為零。N的數值例如是與色輪之遽光片的 顏色數量有關。具體而言，若色輪包括紅色濟光 遽光片與藍色濾光片’則N的數值為3。料，在每個週 期P内’燈源所發出的光線在通過色輪後可依序變成紅光 R、綠光G及藍光B。光閥在每個週期p内例如開啟六次， 以依序讓紅光R、綠光G、藍光B、紅光R、綠光g及藍 光B通過。值得注意的是，本發明並不限定色輪之各遽光 片的顏色及排列順序。 鲁 第二實施例 圖4，示本發明第二實施例之燈源的驅動方法之驅動 波形。凊參閱圖4，本實施例之燈源的驅動方法與第一實 施例之燈源的驅動方法類似，兩者的差異處在於：在本實 施例之燈源的驅動方法中，燈源的第—亮度Li可隨著光閥 每次開啟而有所改變。此外，燈源的第二亮度^亦可隨著 光閥母次關閉而有所改變。更詳細地說，第一亮度I〗可以 有亮度Ln、亮度L12及亮度Ll3等三種變化值，而第二亮 • 度L2可以有亮度L21、亮度La及亮度L23等三種變化值。 藉由調整燈源的亮度，可改變投射於光閥上之紅光R、綠 光G及監光B的光強度，進而調整投影裝置所投影出的顯 示晝面之白平衡或其他色彩參數。 在本實施例中，可施加電流In及電流l3i至燈源，以 使燈源呈現亮度Lu。施加電流丨32及電流Ii2至燈源，以使 燈源呈現亮度L1Z。施加電流Iu及電流l33至燈源’以使燈 源王現焭度L!3。施加電流IZ1及電流&至燈源，以使燈源 12 200847088 Fi / /^ 228I7twf.doc/p 呈現党度L21。施加電流了 現亮度L22。施加電二==122至燈源，以使燈源呈 古 23及电流I43至燈源，以使燈源呈現 党度JL23。 第三實施例 、Λ5衫本發明第三實施例之燈_鶴方法之驅動 波形。明減1® 5，本實施例之燈源的驅動方法盘第 施例之燈_鶴方法_，兩者的差異在於：在本實施 ^中，在每個週期P内’光岐細閉再開啟。光闊關閉 時加至燈源的第-正電W，小於細開啟時施加至燈 源的第一正12 ’且光_閉時施加至燈源的第 流13’之絕對值小於光_啟時施加至㈣的第二負電流 14’之絕對值。施加至燈源的電流可為第—正電流h，或 負電流13’，施加至燈源的電流可為第二正電流或2817twf.doc/p 200847088 IX. Description of the Invention: [Technical Field] The present invention relates to a driving method of a light source (iamP), and in particular to a projection device (P_ection, spleen plus (4)) The driving method of the light source. [Previous Art] Referring to FIG. 1A, a projection device 100 includes a light source 110, a liquid crystal on silicon panel (LCOS panel) 120, a projection lens 130, and a color wheel. (color wheel) 140 and a polarization beam splitting prism l50. Light source 110 emits an illumination beam 112. The color wheel 140 is disposed on the transmission path of the illumination beam 112, and has a red filter 142r, a green filter 142g, and a blue filter 142b, so that the illumination beam 112 is converted into red light 112r according to timing. Green light 112g and blue light 112b. The polarization splitter 150 is disposed on the transmission path of the illumination beam 112 to reflect a portion of the illumination beam 112 having an s-polarization direction to the single crystal solar panel 120. The single crystal solar panel 120 converts the image beam 112 into an image beam 122 having a p-polarization direction and reflects the image beam 122 to the projection lens 13A. Referring to Figures 1A and 1B, reference numeral 50 of Figure 1B is a spot of illumination beam 112 projected onto color wheel 140. Since the color wheel 14 is composed of a plurality of filters 142 of different colors, at the junction 144 of the adjacent two filters 142, the time T1 passing through the left end of the horizontal line 52a of the spot 50 to the junction 144 passes through the right end of the horizontal line 52a. During the time period 12, the level 5 200847088 χ χ / / ^ ^.2817twf.doc/p line 52a will simultaneously fall on the two different color filters i42, thus producing two different colors of light. Therefore, during the period from time T1 to time T2, the single crystal silicon solar panel 120 is in a closed state, resulting in a decrease in image redundancy, and the energy efficiency of the projection apparatus 100 is low. Referring to Fig. 1C, for the same reason, the same problem occurs during the period from the time T3 at the right end of the horizontal line 52b of the spot 50 to the time T4 at which the boundary 144 passes the left end of the horizontal line 52b. 10 Referring to FIG. 1A and FIG. 2, a driving method of a light source is applied to a lamp with the same absolute current (current value equal to ^ or ±) regardless of whether the single crystal silicon liquid crystal panel 120 is in an on state or a closed state. The source is configured to cause the light source 110 to emit light. Specifically, the light source 11 发 emits the illumination beam 112 of the same brightness when the single crystal stone liquid crystal panel 120 is in an open state or a closed state. However, when the single crystal cut liquid crystal panel 120 is turned off (e.g., during the time-to-time period), the light emitted from the light source 11A cannot be utilized by the projection device 100. Therefore, application of current to the lamp source 110 during the period in which the crystallizer panel 12 is turned off causes waste of power source unnecessarily, making the energy efficiency of the projection device 100 low. In addition, in a projection apparatus using a ferroelectric liquid crystal panel, since the total of the driving voltages of the ferroelectric liquid crystal panel in each cycle time (for example, 100 sec to 1 second) is required to be zero, the DC balance is maintained. (DC balance) 'So the ferroelectric LCD panel needs to be turned on and off alternately. In other words, the ferroelectric liquid crystal panel is turned on for half of the time and the other half is turned off during each cycle. Similarly, the application of current to the light source during the period when the ferroelectric liquid crystal panel is turned off will cause 6-2817 tw/doc/p 200847088, and the source is wasted waste-making the projection device (four) energy [invention] The present invention provides a light source carving The projection device method of the driving method of the sacred earth _ to extract the special or partial or all purpose or other purpose of the singulation of the light source (4), and the present invention proposes a driving method of the light source For - projection device. The projection device has a light valve and a light source. The driving method of the light source is to make the light source exhibit a plurality of different kinds of light according to various states of the light valve. In the present invention, the light has a ride with a slight opening; the green-green may include the following steps. When the paste is turned on = the thin brightness is - the second brightness, wherein the second is bright; = the light is turned off. In the embodiment of the invention, the light source (10) can be applied to the same brightness every time the light valve is turned on: The brightness is the same when the source is closed. - Source prior valve mother-off In the embodiment of the invention, the first brightness of the driving of the light source changes with the light valve each time === light source two brightness with the light valve each time off _ Changed. In the embodiment of the present invention, the light source driving method DC signal applies - the first current and the less than the first current to the light source to change the brightness of the light source. 2817 twf.doc / p 200847088 may apply a first current to the light source; and when the light valve is closed, a second current may be applied to the light source. In an embodiment of the invention, the method of driving the light source may include an alternating current The signal alternately applies a first positive current, a second positive current, two first negative currents, and a second negative current to the light source to change the brightness of the light source. In an embodiment of the invention, when the light valve is open The flow of the packet applied to the light source may be a first positive current or a first negative current; and when the light valve is closed, the current applied to the light source may be a second positive current or a second negative current. The current is greater than the first positive current, and the absolute value of the first negative current is greater than the absolute value of the second negative current. Furthermore, before the current applied to the light source changes from the second positive current to the first negative current, The current applied to the light source increases; and is applied to the light source Before the flow from the second negative current to the first positive current, the absolute value of the current applied to the light source can be increased first. In the embodiment of the invention, when the light valve is closed, the current applied to the light source can be a first positive current or a first negative current; and when the light valve is open, the current applied to the light source may be a second positive current or a second negative current. wherein the first positive current is less than the second positive current The absolute value of a negative current is less than the absolute value of the second negative current. In addition, the driving method of the light source may further include applying to the current before the current applied to the light source changes from the second positive current to the first negative current. The current of the light source is increased; and before the current applied to the light source changes from the second negative current to the first positive current, the absolute value of the current applied to the light source may be increased first. In an embodiment of the invention The time elapsed after the light valve is opened 2N times and the 2N second is turned off is one cycle, and is applied to the light source 8 200847088 in each cycle. The current of the c/p is substantially zero, and N is, for example, 3 Or other positive integer. The driving method of the light source is based on A variety of states of light allow the light source to exhibit a variety of different brightnesses. For example, this method can lower the brightness of the light source when the light valve is closed, and increase the brightness of the light source when the light valve is turned on. The driving method of the light source of the present invention can effectively improve the energy efficiency of the projection device using the same. [Embodiment] The following description of the embodiments is referred to the additional drawings for illustrating that the present invention can be used to The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", etc., are only directions referring to the additional schema. Therefore, the directional terminology used is for the purpose of illustration and not limitation. First Embodiment A driving method of a light source of the present embodiment is used in a projection apparatus. The projection device has a light valve and a light source, and the light source is driven by a plurality of different brightnesses depending on various states of the light valve. In addition, the projection assembly may have a color wheel, such as a single crystal liquid crystal panel, a transmissible liquid crystal panel, or a digital micro-mirror device (DMD). Fig. 3 is a view showing driving waveforms of a driving method of a lamp source according to a first embodiment of the present invention. The horizontal axis in Fig. 3 represents time, and the vertical axis contains the color of the light emitted by the light source after passing through the color wheel, the state of the light valve, the brightness of the light source, and the current value applied to the light source. Referring to FIG. 3, in the embodiment, the light width can be directly opened with a sadness and a closed state, and the light valve will alternately open the fish. 9! 2817twf.doc/p 200847088 The closing method can include the following steps. . When the light valve is open, make _ true; M Ll. In addition, when #细_, the original brightness jL' and the second brightness l2 are smaller than the first-level production 1 °, the brightness corresponding to the average output power of the light source is the average brightness ^ § ± > 2 B% < Ll. In this embodiment, the party of the light source is the same every time the light valve is turned on, and P, and the original y» are the same. And the brightness of the light source is the same when the first valve is turned off. The embodiment can be controlled by - exchange of m plus - first positive current, a first positive current h, a first negative current L and a second, Point =!, to change the brightness of the light source. When the light valve is open, the application is: positive current 11 or first negative current l3, and when the light is off, the current applied to the light source may be the second positive current 12 or the second negative current and the second positive current I ??? is greater than the second positive current I2, and the absolute value of the first negative power = 13 is greater than the absolute value of the second negative current U. For example, between the 糸 山 至 至 至 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光Between the time and the day, the light valve is closed, and the current applied to the light source is the second positive current 12 such that the brightness of the light source is the second brightness L·2. Between time 屯 and time A, the light valve is turned on, and the current applied to the light source is the first negative current l3' such that the brightness of the light source is the first brightness L1. Between time & time 屯, the light valve is closed, and the current applied to the light source is the second negative current U such that the shell of the light source is the second brightness ^2. In addition, the absolute value of the first positive current I and the negative negative current I3 may be the same, and the second positive current. The absolute value of the second negative flow 14 can also be the same. ~i2817twf.doc/p 200847088 Undertake the above, because the light beam provided by the light source will not be _, (4) in the correction __low light _ brightness, can have J energy f energy. Further, the brightness of the light source is raised when the light valve is opened, so that the first shell degree 1^ is larger than the average brightness Lavg' so that the brightness of the projection device can be effectively improved. In addition, compared with the prior art, in the case of loss of the same energy source, since the driving method of the light source of the embodiment applies more energy to the light valve when the opening (four) produces higher brightness, (10) is effective. Improve the energy efficiency of the projection device. It should be noted that when the current applied to the lamp source changes from positive to negative or negative to negative, there will be zero current at a certain moment, and it is easy to make the light source blink. In order to improve this problem, the absolute value of the current may be slightly increased when the current applied to the light source is changed from positive to negative or negative to positive, so that the brightness of the light source is slightly increased. In this way, the user does not easily feel that the light source is flickering due to the effect of the persistence of the human eye. Therefore, in the present embodiment, the current applied to the light source is from the second positive current. The current applied to the lamp source can be increased before becoming the first negative current I3. Similarly, the absolute value of the current applied to the lamp source can be increased before the current applied to the lamp source changes from the second negative current L to the first positive current 〖1. For example, at the instant before time d3, a current of 1$ is applied to the light source, and the intensity of the light source is the shell degree L3. Similarly, at the instant before 4, the current source is applied to the light source, and the light source is rendered to have a brightness L3. The current I5 is slightly larger than the first current I2, and the current 16 is slightly smaller than the second negative current 14. In the present embodiment, the time elapsed after the visible light valve is turned on 2N times and turned off 2N times is one period P, and the current applied to the light source 11 200847088 in each period p is a c/p current and substantially zero. . The value of N is, for example, related to the number of colors of the calender of the color wheel. Specifically, if the color wheel includes a red calender sheet and a blue filter ', the value of N is 3. The light emitted by the light source in each period P can be sequentially changed to red light R, green light G and blue light B after passing through the color wheel. The light valve is turned on, for example, six times in each period p to sequentially pass the red light R, the green light G, the blue light B, the red light R, the green light g, and the blue light B. It should be noted that the present invention does not limit the color and arrangement order of the respective patches of the color wheel. LU Second Embodiment Fig. 4 is a view showing driving waveforms of a driving method of a light source according to a second embodiment of the present invention. Referring to FIG. 4, the driving method of the light source of the embodiment is similar to the driving method of the light source of the first embodiment, and the difference between the two is: in the driving method of the light source of the embodiment, the light source is - The brightness Li can vary with each opening of the light valve. In addition, the second brightness of the light source can also vary as the light valve is turned off. More specifically, the first brightness I may have three variations of the brightness Ln, the brightness L12, and the brightness Ll3, and the second brightness L2 may have three variations of the brightness L21, the brightness La, and the brightness L23. By adjusting the brightness of the light source, the light intensity of the red light R, the green light G, and the light monitoring B projected on the light valve can be changed, thereby adjusting the white balance or other color parameters of the display surface projected by the projection device. In this embodiment, current In and current l3i can be applied to the light source such that the light source exhibits brightness Lu. Current 丨32 and current Ii2 are applied to the light source to cause the light source to exhibit brightness L1Z. A current Iu and a current l33 are applied to the light source 'to make the light source L!3. Apply current IZ1 and current & to the light source so that the light source 12 200847088 Fi / / ^ 228I7twf.doc / p presents the party degree L21. The current is applied to the current brightness L22. Apply electricity ==122 to the light source, so that the light source is 23 and the current I43 is to the light source, so that the light source presents the party JL23. Third Embodiment Λ5 衫 The driving waveform of the lamp_crane method of the third embodiment of the present invention. Descending 1® 5, the driving method of the lamp source of the present embodiment, the lamp of the first embodiment _ crane method _, the difference between the two is: in the present embodiment, in each period P, the aperture is thinly closed Open. The positive-positive power W applied to the light source when the light-width is closed is smaller than the first positive 12' applied to the light source when the light is turned on, and the absolute value of the first flow 13' applied to the light source when the light-closed is smaller than the light_ The absolute value of the second negative current 14' applied to (d). The current applied to the light source may be a first positive current h, or a negative current 13', and the current applied to the light source may be a second positive current or
=電流14,。此外，第-正電流h，小於第二正電流^，I 第-負電流V的絕職小於第二負電流14，的絕對值。 一此外，在施加至燈源的電流由正電流轉變為負電流之 W，可先使電流增加。在施加至燈源的電流由負電 為正電流之前，可紐電流祕驗増加。更詳㈣^ 在施加至燈源的電流自第二正電流12，變為第_負〜r 之前，可先使施加至燈源的電流增加。同樣地，在 燈源的電流自第二負電流I4,變為第一正带、土 $ 电〉” ι_ I ]之前，可 先使，至㈣的電流之輯值增加。舉顺說，在時間 d3之如的瞬間，使施加至燈源的電流提高至带、充I，、 燈源呈現亮度l3’。在時間d5的前n使施^至 13 200847088—, 2817twf.doc/p 的電流降低至電流I6,，以使燈源呈現亮度L3,。其中，電 流l5’略大於第二正電流I/，且電流V略小於第二負電流 14,。 、 ’ 第四實施例 圖6是繪示本發明第四實施例之燈源的驅動方法之驅 •動波形。請參閱圖6，本實施例之燈源的驅動方法與第一 實施例之燈源的驅動方法類似，兩者的差異處在於^實施 例之燈源的驅動方法是以一直流訊號來驅動燈源。具體而 言，本實施例是以直流電號交替施加一第一電流及小 於第一電流h之一第二電流L至燈源。當光閥開啟時，施 加第一電流I〗至燈源，以使燈源呈現第一亮度Li。當光閥 關閉時，施加第二電流]^至燈源，以使燈源呈現第二亮丄 L，且第一亮度Li大於第二亮度L2。 儿又 綜上所述，本發明之燈源的驅動方法是根據光閥的多 種狀態來使燈源呈現多種不同的亮度。舉例來說，此方法 可以在光閥關閉時調低燈源的亮度，並在光閥開啟時調高 • 亮度。如此-來，便可減少燈源在光閥_時所= 扣的能源，並將較多的能源運用於光閥開啟時，以使燈源 產士杈尚的壳度。因此，本發明之燈源的驅動方法能有效 提高投影裝置的能源效率。 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明，任何所屬技術領域中具有通常知識者，在不 脫離本發明之精神和範圍内，當可作些許之更動與潤飾， 因此本發明之保護範圍當視後附之申請專利範圍所界定者 14 -2817twf.doc/p 200847088 2 B另外Ϊ發明的任一實施例或申請專利範圍不須達成 ::所，露之全部目的紐點或特點。此外，摘要部分 和標題僅是用來辅助專利文件指貧, 路Β日〜用’並_來限制本 發明之權利範圍。 【圖式簡單說明】 圖1Α為一種習知投影裝置的結構示意圖。 圖1Β與圖1C!會示圖1Α中之照明光束投射至色輪上 的光斑。= current 14,. Further, the first positive current h is smaller than the second positive current ^, and the first-negative current V is less than the absolute value of the second negative current 14. In addition, the current applied to the lamp source is converted from a positive current to a negative current W, and the current can be first increased. The current can be added to the current before the current applied to the lamp source is negative. More (4) ^ The current applied to the lamp source can be increased before the current applied to the lamp source changes from the second positive current 12 to the first to minus ~r. Similarly, before the current of the lamp source changes from the second negative current I4 to the first positive band, the earth $Electrical>” ι_ I ], the value of the current to (4) can be increased first. At the instant of time d3, the current applied to the light source is increased to the band, the charge I, and the light source exhibits a brightness of l3'. The current n at time d5 is applied to the current of 13 200847088-, 2817twf.doc/p Lowering to current I6, so that the light source exhibits brightness L3, wherein current l5' is slightly larger than second positive current I/, and current V is slightly smaller than second negative current 14, . . . The driving waveform of the driving method of the lamp source according to the fourth embodiment of the present invention is shown. Referring to FIG. 6, the driving method of the lamp source of the embodiment is similar to the driving method of the lamp source of the first embodiment, both of which are The difference is that the driving method of the light source of the embodiment is to drive the light source by the direct current signal. Specifically, in this embodiment, the first current is alternately applied by the direct current number and the second current is less than the first current h. L to the light source. When the light valve is open, the first current I is applied to the light source to make the light source appear first Luminance Li. When the light valve is closed, a second current is applied to the light source such that the light source exhibits a second brightness L, and the first brightness Li is greater than the second brightness L2. The driving method of the light source is to make the light source exhibit a plurality of different brightness according to various states of the light valve. For example, the method can lower the brightness of the light source when the light valve is closed, and increase the height when the light valve is opened. • Brightness. In this way, the energy source of the light source at the light valve _ can be reduced, and more energy is applied to the light valve when the light valve is opened, so that the light source is produced by the shell. Therefore, The driving method of the lamp source of the present invention can effectively improve the energy efficiency of the projection device. Although the invention has been disclosed above in the preferred embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art does not Without departing from the spirit and scope of the present invention, the scope of the present invention is defined by the scope of the appended claims. An embodiment or patent application There is no need to reach:: all the points or characteristics of the purpose of the disclosure. In addition, the abstract part and the title are only used to assist the patent document to refer to the poverty, and the road date is used to limit the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a schematic view showing the structure of a conventional projection device. Fig. 1A and Fig. 1C show the spot of the illumination beam projected onto the color wheel in Fig. 1 .
圖2繪示一種習知燈源的驅動方法之驅動波形。 圖3緣示本發明第—實關之燈源的轉方法之驅動 波形。 圖4、、、θ示本鲞明第一實施例之燈源的驅動方法之驅動 波形。 圖5、、’3示本务明苐二貫施例之燈源的驅動方法之驅動 波形。 圖6繪示本發明第四實施例之燈源的驅動方法之驅動 波形。 【主要元件符號說明】 50 ··光斑 52a、52b :水平線 1〇〇 :投影裝置 110 :燈源 Π2 :照明光束 112r、R :紅光 15 200847088」一/p 112g、G :綠光 112b、B :藍光 120 ·早晶砍液晶面板 122 :影像光束 _ 130 :投影鏡頭 • 140 :色輪 142 :濾光片 142r :紅色濾光片 * 142g :綠色濾光片 142b :藍色濾光片 144 :交界處 150 :偏振分光稜鏡 :第一亮度 L2 ·弟"一免度 L3、L3’、Lu、L12、L13、L2i、L22、L23 :免度 Lavg :平均亮度 • P :週期 ΤΙ、T2、T3、T4、山、d2、d3、d4、d5 :時間 I!、Ii’ ：第一正電流 I2、^2’ ·弟二正電流 - I3、13’ ：第一負電流 14、 14’ ：第二負電流 15、 15’、16、工6，、111、Il2、Il3、工21、工22、工23、工31、工32、 工33、Li、I42、143 ·電流 16FIG. 2 is a diagram showing driving waveforms of a driving method of a conventional light source. Fig. 3 is a view showing the driving waveform of the turning method of the lamp source of the first embodiment of the present invention. 4, and θ show driving waveforms of the driving method of the lamp source of the first embodiment of the present invention. Figs. 5 and 3 show the driving waveforms of the driving method of the light source of the second embodiment. Fig. 6 is a view showing driving waveforms of a driving method of a lamp source according to a fourth embodiment of the present invention. [Description of main component symbols] 50 · Spots 52a, 52b: Horizontal line 1〇〇: Projection device 110: Light source Π 2: Illumination beam 112r, R: Red light 15 200847088" One / p 112g, G : Green light 112b, B : Blu-ray 120 · Early Crystal Clear LCD Panel 122 : Image Beam _ 130 : Projection Lens • 140 : Color Wheel 142 : Filter 142r : Red Filter * 142g : Green Filter 142b : Blue Filter 144 : Junction 150: Polarization splitter: first brightness L2 · brother " one degree of freedom L3, L3', Lu, L12, L13, L2i, L22, L23: degree of freedom Lavg: average brightness • P: period ΤΙ, T2 , T3, T4, mountain, d2, d3, d4, d5: time I!, Ii': first positive current I2, ^2' · second positive current - I3, 13': first negative current 14, 14' : second negative current 15, 15', 16, work 6, 11, 111, Il2, Il3, work 21, work 22, work 23, work 31, work 32, work 33, Li, I42, 143 · current 16